STUDY OF HALOACID DEHALOGENASE (HAD) ENZYME FROM Candidatus Liberibacter AND ITS ROLE IN BIOREMEDIATION

Abstract

Organophosphate compounds (OPs) are a group of synthetic chemicals used extensively in agriculture, industry, and household products, such as insecticides, herbicides, and fungicides. They act by inhibiting the activity of acetylcholinesterase (AChE), an enzyme that regulates the transmission of nerve impulses in the body, leading to the accumulation of acetylcholine (ACh), a neurotransmitter and subsequent disruption of the nervous system. These compounds are highly toxic and can cause a range of acute and chronic health effects in humans and animals. The regulation and monitoring of OPs use and exposure is essential to ensure public health and environmental safety. Also, remediation of such hazardous compounds is a crucial environmental concern. Bioremediation is a promising approach to address this issue, where microorganisms are utilized to degrade and detoxify OPs. Several microorganisms such as bacteria, fungi, and algae have been identified for their ability to break down OPs. The enzymatic mechanisms involved in the degradation process have been studied in detail, which includes hydrolysis, oxidation, and reduction. The success of bioremediation depends on various factors such as environmental conditions, substrate concentration, and the presence of other contaminants. Although there are challenges associated with bioremediation, this approach shows promise as an eco-friendly and cost-effective solution for the remediation of OP-contaminated environments. In this study, we have identified a novel phosphatase enzyme from the Haloacid Dehalogenase (HAD) superfamily in Candidatus Liberibacter asiaticus, a gram-negative bacterium that causes citrus greening disease. We have characterized the enzyme and evaluated its potential for the biodegradation of toxic organophosphate compounds. Overall, our study demonstrates the potential of using molecular docking studies to investigate the binding interactions of this enzyme with OPs. The findings from this study can have implications for the development of new bioremediation strategies for these hazardous chemical compounds.